# SDR BIER950015

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 27, 1995
- Submitted: March 26, 2000
- Operation: Air carrier
- Aircraft: N3521S
- Make and model: Piper PA-31-350
- Registry model: [Piper PA-31-350](https://openairdocs.org/model/piper-pa-31-350) (OpenAirDocs)
- Aircraft serial: 317952107
- System (JASC): [2460 · DC Power Distribution System](https://openairdocs.org/jasc/2460)
- Part: Master Switch
- Part number: 4981902
- Condition: Shorted
- Location: Cabin
- Part time: 5,541 hours
- Stage of operation: TX
- Nature of condition: H
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/BIER950015

## Discrepancy

BATTERY WAS DRAINED DOWN TO 22 VOLTS WITH MASTER ELECTRICAL SWITCH IN OFF POSITION.  DETERMINED CAUSE WAS MOISTURE BUILD-UP IN SWITCH CAUSING BATTERY DRAIN.  COMPLIED WITH PIPER SL 886 BY INSTALLATION OF SEALED SWITCH.

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